Signalling Impact Studies

As part of the London Underground S7 Legacy Signalling Project SIMS were employed to produce ‘Signalling Impact Studies’ for 17 sites on the District Line. The purpose of these studies was to identify all the signalling issues associated with the introduction of the new S7 trains in order to understand the remedial works that would need to be undertaken. The S7 trains are longer than the ‘C’ and ‘D’ Stock trains currently in operation, exhibit reduce sighting characteristics and will initially operate under tripcock protection utilising the existing signalling system. To identify any potential issues SIMS reviewed the following aspects of the existing signalling system at each site:

• Signal Overlaps;
• Signal Berths;
• Sighting of all platform signals and signage;
• Fouling Points;
• Route Locking;
• Timing Sections;
• Equipment requiring electromagnetic immunisation from S7 trains.
• Where applicable SIMS provided recommendations as to the remedial works required or identified where further, more complex, analysis might be required.

SIMS’ wide experience of London Underground signalling combined with their innovative presentation of the Signalling Impact Studies (improving substantially on those produced by other parties) ensured London Underground received a useful suite of documents to help define the scope of work required to bring the new trains into service.